[mmmattt]

The experiment compared .wav files directly ripped from the cd to these same files played through copper/banana/mud.

So yes, the “good” audio is good.

[kachapopopow]

less about the files, more about the audio equipment in between

[atoav]

Well ot is very easy to figure that out using the Null method.

You have the original recording (A) and play through whatever chain recording it at the end, resulting in recording (B).

You now place A and B into seperate tracks of the DAW of your choice and align them in time. You flip the polarity on B and adjust the levels till the output level is minimized (to account for level changes in your playback/recording chain).

The mixed signal is the difference. If it is imperceptibly silent, the difference is in fact imperceptable.

And with this simple method you can demask a metric ton of bullshit, like differences in wire materials or capacitors materials.